Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs

Timm John, Nikolaus Gussone, Yuri Y. Podladchikov, Gray Edward Bebout, Ralf Dohmen, Ralf Halama, Reiner Klemd, Tomas Magna, Hans Michael Seitz

Research output: Contribution to journalArticle

139 Citations (Scopus)

Abstract

At subduction zones, oceanic lithosphere that has interacted with sea water is returned to the mantle, heats up during descent and releases fluids by devolatilization of hydrous minerals. Models for the formation of magmas feeding volcanoes above subduction zones require largescale transport of these fluids into overlying mantle wedges 1-3. Fluid flow also seems to be linked to seismicity in subducting slabs. However, the spatial and temporal scales of this fluid flow remain largely unknown, with suggested timescales ranging from tens to tens of thousands of years 3-5. Here we use the Li-Ca-Sr isotope systems to consider fluid sources and quantitatively constrain the duration of subduction-zone fluid release at ∼ 70 km depth within subducting oceanic lithosphere, now exhumed in the Chinese Tianshan Mountains. Using lithium-diffusion modelling, we find that the wall-rock porosity adjacent to the flowpath of the fluids increased ten times above the background level. We show that fluids released by devolatilization travelled through the slab along major conduits in pulses with durations of about ∼ 200 years. Thus, although the overall slab dehydration process is continuous over millions of years and over a wide range of pressures and temperatures, we conclude that the fluids produced by dehydration in subducting slabs are mobilized in short-lived, channelized fluid-flow events.

Original languageEnglish
Pages (from-to)489-492
Number of pages4
JournalNature Geoscience
Volume5
Issue number7
DOIs
Publication statusPublished - Jul 2012
Externally publishedYes

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island arc
fluid flow
slab
fluid
subduction zone
oceanic lithosphere
dehydration
mantle
hydrous mineral
background level
wall rock
lithium
seismicity
volcano
porosity
isotope
seawater
timescale
mountain
modeling

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

John, T., Gussone, N., Podladchikov, Y. Y., Edward Bebout, G., Dohmen, R., Halama, R., ... Seitz, H. M. (2012). Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs. Nature Geoscience, 5(7), 489-492. https://doi.org/10.1038/ngeo1482

Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs. / John, Timm; Gussone, Nikolaus; Podladchikov, Yuri Y.; Edward Bebout, Gray; Dohmen, Ralf; Halama, Ralf; Klemd, Reiner; Magna, Tomas; Seitz, Hans Michael.

In: Nature Geoscience, Vol. 5, No. 7, 07.2012, p. 489-492.

Research output: Contribution to journalArticle

John, T, Gussone, N, Podladchikov, YY, Edward Bebout, G, Dohmen, R, Halama, R, Klemd, R, Magna, T & Seitz, HM 2012, 'Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs', Nature Geoscience, vol. 5, no. 7, pp. 489-492. https://doi.org/10.1038/ngeo1482
John, Timm ; Gussone, Nikolaus ; Podladchikov, Yuri Y. ; Edward Bebout, Gray ; Dohmen, Ralf ; Halama, Ralf ; Klemd, Reiner ; Magna, Tomas ; Seitz, Hans Michael. / Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs. In: Nature Geoscience. 2012 ; Vol. 5, No. 7. pp. 489-492.
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